Tonight... get on the record with Greta!

He put sex offenders, drug dealers and career criminals behind bars. Now his body is found horribly mutilated and dumped in a ditch.

Who’s behind the death of this high-profile prosecutor? Greta goes inside the mysterious death of assistant U.S. Attorney Jonathan Luna (search) on tonight’s edition of On the Record.

Plus, the latest on the search for missing University of North Dakota student Dru Sjodin.

And later, Playboy hits the big 5-0. We'll have a special look back at the magazine.

Don't miss On the Record tonight at 10 p.m. ET!

--All topics and guests subject to change

--The Associated Press contributed to this story.